71541521 has 8 divisors (see below), whose sum is σ = 76396800. Its totient is φ = 66845520.

The previous prime is 71541499. The next prime is 71541529. The reversal of 71541521 is 12514517.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71541521 - 2²⁶ = 4432657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71541529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38891 + ... + 40688.

It is an arithmetic number, because the mean of its divisors is an integer number (9549600).

Almost surely, 2^71541521 is an apocalyptic number.

It is an amenable number.

71541521 is a deficient number, since it is larger than the sum of its proper divisors (4855279).

71541521 is a wasteful number, since it uses less digits than its factorization.

71541521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79639.

The product of its digits is 1400, while the sum is 26.

The square root of 71541521 is about 8458.2220945066. Note that the first 3 decimals coincide. The cubic root of 71541521 is about 415.1318514610.

The spelling of 71541521 in words is "seventy-one million, five hundred forty-one thousand, five hundred twenty-one".